Which of the following refrigerants is a CFC-type refrigerant?
A. R-22.
B. R-123.
C. R-134a.
D. R-12.
Answer: D
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Fill in the blank(s) with correct word
When using a shingle hatchet, the sliding gauge is used to measure the _____
a. gap between shingles b. gap between the nails and the top of the shingle c. amount that each shingle should overlap the shingle next to it d. amount of exposed surface for each shingle
Which of the following statements best describes electronic timing relays?
A) Electronic timing relays are more repeatable than pneumatic timing relays. B) Electronic timing relays are more accurate than pneumatic timing relays. C) Electronic timing relays are more economical than pneumatic timing relays. D) All of the above
Zener diodes can be used in the feedback circuit to limit a comparator output. What is this method called?
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